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Plants produce a wide diversity of compounds. Broadly, these are separated into primary metabolites, which are necessary for ...

This article covers the Punjab Board's 2025–2026 Class 11 Physics Syllabus. Class 11 students can download the syllabus in PDF format to become acquainted with the subjects that will be studied during ...

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Just as we learned earlier how to use a sequence of TRUE and FALSE values to extract a parts of a vector, we now see how to do the analogous thing for data frames: We can use a sequence of TRUE and ...